Special features of hydrogen sulfide cracking of welded points after short-term hydrogen diffusion

1991 ◽  
Vol 27 (1) ◽  
pp. 29-32
Author(s):  
E. A. Savchenkov ◽  
A. Ya. Gret'yak ◽  
R. R. Aitkulov
Keyword(s):  
Hydrogen Sulfide ◽  
Hydrogen Diffusion ◽  
Short Term ◽  
Hydrogen Sulfide Cracking

The mechanism of hydrogen-sulfide cracking in steels

1993 ◽  
Vol 35 (2) ◽  
pp. 68-71
Author(s):  
V. M. Kushnarenko ◽  
O. M. Masyuto
Keyword(s):  
Hydrogen Sulfide ◽  
Hydrogen Sulfide Cracking

Hydrogen Sulfide Cracking of Downhole Tubulars

1991 ◽  
Author(s):  
B. Kermani ◽  
J.W. Martin ◽  
D.F. Waite
Keyword(s):  
Hydrogen Sulfide ◽  
Hydrogen Sulfide Cracking

Endogenous hydrogen sulfide in perivascular adipose tissue: role in the regulation of vascular tone in physiology and pathology

2013 ◽  
Vol 91 (11) ◽  
pp. 889-898 ◽  
Author(s):  
Jerzy Bełtowski
Keyword(s):  
Insulin Resistance ◽  
Adipose Tissue ◽  
Hydrogen Sulfide ◽  
Vascular Tone ◽  
Compensatory Mechanism ◽  
Short Term ◽  
Insulin Sensitizer ◽  
Perivascular Adipose Tissue ◽  
S Oxidation ◽  
Lipophilic Statin

Hydrogen sulfide (H2S) is synthesized from l-cysteine by cystathionine β-synthase (CBS) or cystathionine γ-lyase (CSE), and is enzymatically metabolized in mitochondria by sulfide:quinone oxidoreductase (SQR). Recent studies have indicated that H2S is synthesized by CSE in perivascular adipose tissue (PVAT), and is responsible for the anticontractile effect of PVAT on adjacent vessels. The lipophilic statin atorvastatin increases PVAT-derived H2S by suppressing its mitochondrial oxidation; the effect that results from statin-induced depletion of ubiquinone. Experimental obesity induced by a highly palatable diet has a time-dependent effect on H2S in PVAT. Adipose tissue hypoxia suppresses H2S oxidation and increases its level in short-term obesity not associated with insulin resistance. In contrast, in long-term obesity, insulin resistance and (or) hyperinsulinemia result in the down-regulation of CSE and H2S deficiency, which is corrected by treatment with the insulin sensitizer rosiglitazone. In addition, cannabinoid CB1 receptor agonist administered for 2 weeks increases H2S by impairing mitochondria biogenesis. This indicates that the rate of mitochondrial H2S oxidation plays an important role in the regulation of H2S level in PVAT. Up-regulation of H2S signaling in short-term obesity and (or) by elevated endocannabinoids may be a compensatory mechanism that maintains vascular tone, despite endothelial dysfunction.

scholarly journals Identification of the lethal toxic impact of hydrogen sulfide to the Amphipods Orchestia bottae (Milne-Edwards, 1840; Black Sea) in vitro — in through-flow incubation chambers

2016 ◽  
Vol 1 (3) ◽  
pp. 73-74
Author(s):  
M. B. Gulin
Keyword(s):  
Hydrogen Sulfide ◽  
Black Sea ◽  
Flow Cell ◽  
Short Term ◽  
Toxic Impact ◽  
Redox Flow Cell ◽  
Through Flow ◽  
Series Of Experiments ◽  
The Impact

The impact of H2S on some representatives of marine zoobenthos was studied in a series of experiments with the use of the redox flow cell. All the experiments have shown the rapid mortality of O. bottae under the influence of H2S and, on the contrary, the relatively high resistance of O. bottae to a short-term deficiency of dissolved oxygen.

scholarly journals Increasing the construction strength of petroleum pipes operating in agressive environment

2021 ◽  
pp. 70-76
Author(s):  
V.S. Chmeliova ◽  
H.I. Perchun
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Hydrogen Sulfide ◽  
Brittle Fracture ◽  
High Resistance ◽  
Structural Strength ◽  
Aggressive Environment ◽  
The Impact ◽  
Resistance To Brittle Fracture ◽  
Hydrogen Sulfide Cracking

Purpose. Questions about ways to increase the structural strength of oil country tubular goods are considered. Alloying and heat treatment of medium-alloy steels should ensure: pro-carbonization to the structure of martensite and lower bainite with a minimum carbon content (C ≤ 0.3 %), high resistance to brittle fracture and hydrogen embrittlement, the formation of uniformly distributed finely dispersed carbides and sulphides of a round shape to reduce diffusion mobile hydrogen is absorbed by steel. Propose modes of thermal treatment of casing pipes that provide the required level of mechanical and operational properties. Methodology. We used standard techniques for determining the mechanical properties in tension, dynamic bending tests and fracture studies. Results. The modes of heat treatment of casing pipes of strength category E, L are proposed, which provide the required level of mechanical and operational properties and an increase in structural strength. Originality. A systematic analysis of the influence of various factors on the structural strength of oil country tubular goods operating in an aggressive environment has been carried out. The highest degree of correlation between the value of the impact toughness and the tough component in the fracture is shown. Cooling of pipes with a nozzle sprayer of the design of the Department of Heat Treatment of Metals of NMetAU, which provides high resistance to brittle fracture by increasing the proportion of the viscous component and changing the microrelief of the cup fracture. Practical value. The proposed technology of heat treatment of oil pipes, working in an aggressive environment, provides the required level of mechanical properties and resistance to hydrogen sulfide cracking. Keywords: structural strength; oil country tubular goods; alloying; heat treatment; strength categories;temperature and deformation parameters; hydrogen sulfide cracking; brittle fracture resistance

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